Closure for metal containers



Sept. 24, 1935. G. w. TODD 2,015,465

CLOSURE FOR METAL CONTAINERS Filed Nov. 13, 1950 2 Sheets-Sheet 1 IN VENTOR A TTORNE Y Sept. 24, 1935. G. w. TODD 2,015,465

CLOSURE FOR METAL CONTAINERS Filed Nov. 13, 1950 2 Sheets-Sheet 2Patented Sept. 24, 1935 PATENT OFFIQE' CLOSURE FOR METAL CONTAINERSGeorge W. Todd, Youngstown, Ohio, assignor to The Petroleum llron WorksCompany of Ohio, Sharon, Pa., a corporation of Ohio Application November13, 1930, Serial No. 495,476

' 1 Claim.

insurance costs and to make for a simple and comparatively inexpensiveconstruction.

In the attainment of such objects I provide a ring or sput, the bore ofwhich is adapted and arranged to receive and completely house theconventional screw-threaded plug, the outer end of the ring extendingbeyond the gasket seat of the head of the plug and having internal andexternal rim seats, whereof one accommodates a sealing element andwhereof the other constitutes an under shoulder or abutment againstwhich may be forced in engaging or clenching relation the marginal wallof any conventional form of resilient metal crown or disk closure.

The nature, characteristic features and scope of the invention morereadily will be understood from the following detailed description takenin connection with the accompanying drawings forming a part hereof,wherein:

Figure 1 is a plan view of a container wall having an opening providedwith a ring or sput embodying features of the invention.

Fig. 2 is a vertical sectional view of the same.

Fig. 3 is a sectional View of the complete closure.

Figs. 4, 5 and 6 are sections of varied types of caps.

Fig. '7 is a sectional view of the closure with a non-tamper provision.

Fig. 8 is a sectional view of the locking ring, Fig. '7.

Referring to the drawings, 5 represents a. container wall having anopening in which is secured in any usual or approved manner a ring orsput 6. According to my invention the latter is of unit constructionsuch as a casting or forging having a bore of differential cross-sectionwholly to receive a plug of conventional type, that is to say,

the lower bore l is screw-threaded to take the shank of the plug and theupper bore 8 is of increased diameter to accommodate the head of theplug and is defined by a ledge or shoulder 9 to support a gasket orpacking ring Ill properly to seal the head of the plug.

The crown of the sput is located beyond the head of the plug and incross-section is of generally bulbous form, that is to say, its rim hasa pronounced external flange or bead l l of arcuate form terminating ina bottom abutment or shoulder I2; and intermediate the rim and theperpendicular wall of the sput there is a groove 5 or channel I3 toaccommodate a packing or sealing element I 4.

The parts described are so constructed that when the plug is screwedhome there is clearance between its head and the crown of the sput 10 toaccommodate the sealing element M. The latter may be a separate elementor it may be of the type that is carried by a conventional form ofresilient metal cap.

Manifestly the external seal may be locked to place by variousexpedients of resilient metal caps. For example, the plain disk l5 shownin Fig. 4 may have its margin curled over the crown of the sput so as toclench the bottom shoulder or abutment as shown at H5 in Fig. 3; orthere may be employed a conventional form of flanged disk I! equippedwith a cork disk as shown in Fig. 5. And in continuation of thisthought, there is shown in Fig. 6 a cap of the conventional typeembodying a body portion l8 which may be flexed inwardly or outwardly tocause its slitted flange or skirt 19 to engage or be disengaged from theabutment. This form of cap has the merit that it may be manipulated byhand in the well-known manner.

In order to prevent unauthorized or accidental removal of the slip-oncap and positively to insure of its sealing function, I sometimes employan external ring 20 of angular section whereof one limb engages the topof the cap and whereof the other limb or skirt engages that part of thecap impinging upon the abutment as shown in Fig. 7. Obviously, in orderto remove the resilient cap and so have access to the plug, it isnecessary to manipulate the locking ring to the point of destruction.Thus it constitutes a telltale or evidence of tampering or pilfering.

. Having described the invention, what I claim as new is:

The combination of a plug fitting and a plug having threaded engagementtherewith, the plug and fitting presenting abrupt annular shoulders tocooperate with an interposed sealing disk to be compressed in thethreaded action of the plug,

the fitting having an annular part extending beyond the outer plainsurface of the plug when the latter is seated, the inner margin of theextended portion of the fitting having a recessed portion arrangedwholly beyond the peripheral margin of the plug, a sealing disk seatedin said recess and. bearing on the plain outer surface of the plug, acap overlying and bearing throughout on the surface of the lattersealing disk and having edge interlocking with the outer surface of thefitting, and a ring bearing on the cap and overlying and interlockingwith the cap in that portion engaged with the fitting.

GEORGE W. TODD.

